Subliminal "I-Want-You-Back Letter" to my Ex?

Okay, I have a question for you guys. I have hand written a short and sweet good-bye letter to my ex. We've been broken up for three months at the end of this month, no contact whatsoever. At the end of June (when we broke up), he asked if we could still be friends, but I declined. I've already decided that I am going to give it to him, so that is not the issue, which is if this letter is suitable or not:

"Dear ---,

I know that we have not spoken in awhile. You are probably wondering why I am writing you at all. Well, remember when you stated that your mother is not renewing the lease on the house? I know you are both departing, and, I did not want you to go before I got to say good-bye.

I expect you have progressed. You may even still harbor some negativity in my direction, and I can live with that--I have lived with that. But that is all okay. I only want the best for you, and I want you to be happy, now and forever. I do not know if you are happy, but I presume that you are, and I want it to stay that way. The only thing I am most sad about though, is a wonderful friend I have lost, and will miss so, so much. Take care, ---. Be well. Stay safe."

I honestly do want a chance to say good-bye, because I'm not sure if he is moving or not, that's just what he told me at the end of June. I am also okay with him not responding, I've reached that point, because it will be closure for me, and I will feel satisfied that I did everything I could. But, if he does respond, I kind of want to get a line of communication going. Is there anything I should change, delete, or add in? Also, what would be the best way of delivering it to him? I was thinking I could place it under his windshield wiper in an envelope (like a parking ticket) late Sunday night, that way I know he would definitely get it the next time he used his car (he lives down the street from me). Any suggestions would be helpful. Thanks!